如何检查双精度值是否为空? [英] How to check if a double is null?

问题描述

我正在查询一个数据库，但我得到的一些结果为空.我将这些值设置为数据类型为 double 的变量.让我们称变量为结果".所以我尝试设置一个 if 语句来查看它等于 Null ，这当然不起作用.这是我的 if 语句代码:

I'm querying a database and some of the results I'm getting are null. I'm setting these values to a variable with a datatype of double. Let's call the variable "results". So I tried setting up an if statement to see it equals Null which of course didn't work. Here is the code I have for that if statement:

if (results == null)
{
     results = 0;
}

我用这段代码得到的错误是:

The error I get with this code is:

The operator == is undefined for the argument type(s) double, null

有没有更好的方法来确定它是否为空?

Is there a better way to determine if it's null?

推荐答案

我建议使用 Double 而不是 double 作为您的类型，然后您检查 null.

I would recommend using a Double not a double as your type then you check against null.

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